﻿using System;
using System.Collections;
using System.ComponentModel;
using System.Globalization;
using System.Drawing;
using System.Reflection;
using System.ComponentModel.Design.Serialization;

#if NETSTANDARD2_0
namespace FastReport.TypeConverters
{
	public class SizeConverter : TypeConverter
	{

		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.CanConvertFrom"]/*' />
		/// <devdoc>
		///      Determines if this converter can convert an object in the given source
		///      type to the native type of the converter.
		/// </devdoc>
		public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
		{
			if (sourceType == typeof(string))
			{
				return true;
			}
			return base.CanConvertFrom(context, sourceType);
		}

		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.CanConvertTo"]/*' />
		/// <devdoc>
		///    <para>Gets a value indicating whether this converter can
		///       convert an object to the given destination type using the context.</para>
		/// </devdoc>
		public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
		{
			if (destinationType == typeof(InstanceDescriptor))
			{
				return true;
			}
			return base.CanConvertTo(context, destinationType);
		}

		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.ConvertFrom"]/*' />
		/// <devdoc>
		///      Converts the given object to the converter's native type.
		/// </devdoc>
		public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
		{

			string strValue = value as string;

			if (strValue != null)
			{

				string text = strValue.Trim();

				if (text.Length == 0)
				{
					return null;
				}
				else
				{

					// Parse 2 integer values.
					//
					if (culture == null)
					{
						culture = CultureInfo.CurrentCulture;
					}
					char sep = culture.TextInfo.ListSeparator[0];
					string[] tokens = text.Split(new char[] { sep });
					int[] values = new int[tokens.Length];
					TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int));
					for (int i = 0; i < values.Length; i++)
					{
						// Note: ConvertFromString will raise exception if value cannot be converted.
						values[i] = (int)intConverter.ConvertFromString(context, culture, tokens[i]);
					}

					if (values.Length == 2)
					{
						return new Size(values[0], values[1]);
					}
					else
					{
						throw new ArgumentException();
					}
				}
			}

			return base.ConvertFrom(context, culture, value);
		}

		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.ConvertTo"]/*' />
		/// <devdoc>
		///      Converts the given object to another type.  The most common types to convert
		///      are to and from a string object.  The default implementation will make a call
		///      to ToString on the object if the object is valid and if the destination
		///      type is string.  If this cannot convert to the desitnation type, this will
		///      throw a NotSupportedException.
		/// </devdoc>
		public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
		{
			if (destinationType == null)
			{
				throw new ArgumentNullException("destinationType");
			}

			if (value is Size)
			{
				if (destinationType == typeof(string))
				{
					Size size = (Size)value;

					if (culture == null)
					{
						culture = CultureInfo.CurrentCulture;
					}
					string sep = culture.TextInfo.ListSeparator + " ";
					TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int));
					string[] args = new string[2];
					int nArg = 0;

					// Note: ConvertToString will raise exception if value cannot be converted.
					args[nArg++] = intConverter.ConvertToString(context, culture, size.Width);
					args[nArg++] = intConverter.ConvertToString(context, culture, size.Height);

					return string.Join(sep, args);
				}
				if (destinationType == typeof(InstanceDescriptor))
				{
					Size size = (Size)value;

					ConstructorInfo ctor = typeof(Size).GetConstructor(new Type[] { typeof(int), typeof(int) });
					if (ctor != null)
					{
						return new InstanceDescriptor(ctor, new object[] { size.Width, size.Height });
					}
				}
			}

			return base.ConvertTo(context, culture, value, destinationType);
		}

		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.CreateInstance"]/*' />
		/// <devdoc>
		///      Creates an instance of this type given a set of property values
		///      for the object.  This is useful for objects that are immutable, but still
		///      want to provide changable properties.
		/// </devdoc>
		public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues)
		{
			if (propertyValues == null)
			{
				throw new ArgumentNullException("propertyValues");
			}


			object width = propertyValues["Width"];
			object height = propertyValues["Height"];

			if (width == null || height == null ||
				!(width is int) || !(height is int))
			{
				throw new ArgumentException();
			}
			return new Size((int)width,
								(int)height);
		}

		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.GetCreateInstanceSupported"]/*' />
		/// <devdoc>
		///      Determines if changing a value on this object should require a call to
		///      CreateInstance to create a new value.
		/// </devdoc>
		public override bool GetCreateInstanceSupported(ITypeDescriptorContext context)
		{
			return true;
		}

		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.GetProperties"]/*' />
		/// <devdoc>
		///      Retrieves the set of properties for this type.  By default, a type has
		///      does not return any properties.  An easy implementation of this method
		///      can just call TypeDescriptor.GetProperties for the correct data type.
		/// </devdoc>
		public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes)
		{
			PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(Size), attributes);
			return props.Sort(new string[] { "Width", "Height" });
		}


		/// <include file='doc\SizeConverter.uex' path='docs/doc[@for="SizeConverter.GetPropertiesSupported"]/*' />
		/// <devdoc>
		///      Determines if this object supports properties.  By default, this
		///      is false.
		/// </devdoc>
		public override bool GetPropertiesSupported(ITypeDescriptorContext context)
		{
			return true;
		}
	}

}
#endif
